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A115399 as a simple table

na(n)
01
10
2-1
31
42
5-4
6-3
715
8-1
9-51
1042
11154
12-274
13-372
141341
15405
16-5599
172783
1820295
19-27313
20-61139
21160797
22124462
23-767702
2494964
253145986
26-2930086
27-10956466
2821290868
2929513156
30-114974111
31-33473459
32522016279
33-279684579
34-2031228003
352867285041
366493289367
37-17791297065

[1,0,-1,1,2,-4,-3,15,-1,-51,42,154,-274,-372,1341,
 405,-5599,2783,20295,-27313,-61139,160797,124462,
 -767702,94964,3145986,-2930086,-10956466,21290868,
 29513156,-114974111,-33473459,522016279,
 -279684579,-2031228003,2867285041,6493289367,
 -17791297065]